Houdini 18.5 bullet simulate small object takes 50G RAM ??
2868 9 1- Jerry Jerry
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Houdini 18.5.462 on linux, ubuntu
when simulate 6000 bullet pieces, at first frame the memory usage is at 50G/64G. this only happen when the bullet object is very very small, at 10cm in diameter and divided as 6000 pieces. But if i simulate for a 100cm(diameter)object also divided as 6000 pieces, the memory usage is just 5G, very efficient, and very fast, i know bullet is good for big simulation, but is there a way to make bullet work with a small object sim? like a sphere at 1cm in diameter and divided as 10000 pieces ?? i don't want to use RBD solver.
thanks in advance.
i have attached the hip, be careful, this might make your computer going out of RAM.
when simulate 6000 bullet pieces, at first frame the memory usage is at 50G/64G. this only happen when the bullet object is very very small, at 10cm in diameter and divided as 6000 pieces. But if i simulate for a 100cm(diameter)object also divided as 6000 pieces, the memory usage is just 5G, very efficient, and very fast, i know bullet is good for big simulation, but is there a way to make bullet work with a small object sim? like a sphere at 1cm in diameter and divided as 10000 pieces ?? i don't want to use RBD solver.
thanks in advance.
i have attached the hip, be careful, this might make your computer going out of RAM.
Edited by Jerry Jerry - 2021年2月27日 23:35:37
- mawi
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- Jerry Jerry
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mawi
Im guessing here since I cant look at your file.
There are parameters on the bullet object called "collision padding" and "shrink collision geometry". These are in absolute numbers, so in the small scenes all the collision objects intersect on first frame.
I have change those setting and tried many time, with different one, still not working, the RAm usage go up very quickl, by lower the "collision padding" and "shrink collision geometry", still the same result. taking 50G Ram quickly.
i'm thinking, maybe this is a bug?
- Benjamin Lemoine
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- Jerry Jerry
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Benjamin Lemoine
Hello
As mawi said decrease collision padding and also your node tree wasn't connected correctly
after those change it run smoothly :
Actually, when the sphere hits the ground, the RAM usage go high again, i did the same thing as you showed me here.
with constrain Network it runs before hits the ground, but when the sphere hits the ground, the RAM usage go crazy again.
- Jerry Jerry
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- Benjamin Lemoine
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Yes the sphere hit the ground and everything was working.. Did you decrease the collision padding ?, just try with zero padding; for this kind of sim it's ok! The default correspond more to big building piece than to very small chunk. If it got impossible stuff to resolve it will make your ram crazy , you've got to give the solver a bit of help too
If i recall correctly you didn't relax at all the point in your scatter , try a relax of 1 even decreasing the radius scale it will avoid super super small piece ....
If i recall correctly you didn't relax at all the point in your scatter , try a relax of 1 even decreasing the radius scale it will avoid super super small piece ....
Edited by Benjamin Lemoine - 2021年3月1日 06:04:32
- Jerry Jerry
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Benjamin Lemoine
Yes the sphere hit the ground and everything was working.. Did you decrease the collision padding ?, just try with zero padding; for this kind of sim it's ok! The default correspond more to big building piece than to very small chunk. If it got impossible stuff to resolve it will make your ram crazy , you've got to give the solver a bit of help too
If i recall correctly you didn't relax at all the point in your scatter , try a relax of 1 even decreasing the radius scale it will avoid super super small piece ....
possible to upload your hip? i did all you have suggested, but the RAM is still go crazy
houdini ver 18.5.449
- Benjamin Lemoine
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- Jerry Jerry
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Benjamin LemoineThanks man!
Yes the sphere hit the ground and everything was working.. Did you decrease the collision padding ?, just try with zero padding; for this kind of sim it's ok! The default correspond more to big building piece than to very small chunk. If it got impossible stuff to resolve it will make your ram crazy , you've got to give the solver a bit of help too
If i recall correctly you didn't relax at all the point in your scatter , try a relax of 1 even decreasing the radius scale it will avoid super super small piece ....
i have upgrade to 18.5.499, everything works fine, the RAM usage is not going crazy.
thanks again for your help,!!!!
thanks
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